Improvement in smoke and gas consuming furnaces



v v SSheets--SheejL ILM. Mavis. SMOKE AN@ GAS CONSUMING FURNACE. N,176,639 Patented Apr125,18v76.A

l 3 Sh e et s-Sh e et 3 -K. M. J'ARVIS. v

SMOKE AND GAS CONSUMING FURNACE. Y

N,176,639, Patented Apri1-z5,1s7e.

' KrNesBURY M. Mawson r'nABoDv,MASSACHUSETTS.

Speciication'iform-ing partzof VLettersPatent No.V [765639,*datedupril 25,' 1876; applicationvliled f April 3, we.

To allfwhom tranny/f concern. Beit known that 1, KINGSBURYI=M. JAR- Vls, of Peabody, in the county of Essex,-and State ofMassachusetts, have in vented an Im s yprovement in Smoke and `Gras Gon sumin gFur- .nacef-of` which the following is f-.a specifica-v tion:

vTh-is invention vrelates to fvsmoke vand gas consumin g'tunnaeesfof-steain=boilers ,and con` sists iii-:the Icombination, with the furnace, of lues,as hercinatteuset-Lforth, whereby heated' air is delivered to the column: ofgas freed'lby' the combustion.l of ithe =coal through 'the `,bottomwand sides ofl.thecombustion-chamber, the heated air acting to'reducethe-tem-peraturelof the. gas..n1u,ch.,1ess. lthan cold rair, thereby permitting the oxygen of the heated air to mingle with the gas at a temperature nearer the` tem! perature of ignition, making; the combustion more thorough Whilefthe sigas 1f sunder the boiler, Where the greatest heat is needed, and in connection With the admission of heated air, as described, the boiler is elevated more than usual to aii'ord an enlarged space sufcient for thorough `expansion and combustion of the gas and carbon.

Figure lis a front view of a furnace of a stationary engine, all the doors being open. Fig. 2, a cross-section taken just back ofthe end of the boiler and through the grate; Fig.

3,`\a 4longitudinal section and Fig. 4, a plan of the iiue in the side wall of the furnace.

Theboiler4 a isl of usual or any ordinary construction. b b are the grate-bars; c, the

1 ash'pit; d, the bridge-wall; and e, the combustion-chamber. Backof this bridge-Wall is an open space',f, covered from side to side of the furnace with a strong cast-iron plate, g, perforated with a great number of small holes, through which passes heated air discharged from lucs h, formed in this instance from pipes communicating with the atmosphere at the back of the furnace. These pipes are laid close up to or into the bottom of the combustion-chamber, so that lthe gases therein Willheat quite hot the air in the dues, and the air soheated is directed downward into the chamber or space f, Where it is allowed to expand, and its current is broken, so thatin leaving the chamber through the perforations in the plate it is (lischargedevenly from side to side of the eomlni'stion-chamber, :and is mixedV with and supplied .uniformly to -thegases passing over `the v`brid, ,'e.wall, and this eveny and uniform this supply off-heated air :at the under-sideof thejgas; passing over the rbridge-Wallfl also throw intothe 11am e--or ygas a column ofxheated airfrom each-side'of `the-combustion-chamber, abovetthe f perforated plate. V.The-.air to be heatedfand suppliedfrom openingsfi at-each side ofthe combustion-ch'amberenters thelopenings jj eithersat the 1 side :of v theffurnace-wall,

traverses the iues l 2 3, &c.,'-(Ysee-Fig."4,) such iues being :made-in the vside -wa-llof the furnacel fire-chamber, and-from'these-iiues the heated air issues ati in a strong current.`

This heated air is discharged laterally into the flame or gas just as it passes over the bridge-Wall, and coming from opposite sides, and into the flame or gas, at substantially a right angle, it breaks up the regularity ofthe current of ame or gas, as will be fully evident to practical persons, and the heated air imparts its supply of oxygen to the flame or gas, and at this time, the gas or flame being disturbed and checked by countercurrents, receives at its under side the body of heated air rising through the perforated plate in numerous small jets that penetrate the Whole mass of ame or gas from side wall to side wall, andthe gas or iame, with its commingled heated air in the process of combustion, rolls and moves about in the combustion-chamber, and laps up about the under portion of the boiler in a manner not possible where the ame or gas is permitted to move over the bridge-Wall in `a regular defined current, and without great disturbing currents.

The mixing of heated air in this Way with the flame or gas, as described, makes most perfect combustion, and-enables me to burn coal or pressed tan or screenings.

A boiler-say, of one hundred horsepowerwhen set according to my improvements, will have the grate placed twenty-six inches below it, the top of the bridge-Wall will be fourteen inches below the bottom of the boiler, and the under side of the boiler at its back endv will be twentyfour inches above the Hoor of the combustion chamber. This, it will be noticed, a'ords more space than usual for complete combustion of the gas. The dues in the side wall, as shown in Fig. 4, instead of being arranged horizontally, `might be ar ranged vertically, or at any' other angle in the side walls, so long as the iues are made as lon gas possible, so as to retain the air between the side walls long enough to thoroughly heat it. By conducting the air through tortuous iiues formed in the hollow side walls, I am enabled to heat it much better than would be possible were the ues direct.

Any desired numbei` and diameter of pipes may be employed for the ues h, according to the quantity of airlto be admitted, and in some instances I propose. to make them tortuous, and, if desired, I may form two or more metallic plates with projections arranged substantially as shown in Fig. 4, and such plates may be embedded in the brick-Work of the fur nace forming the under side ot' the combustion-chamber, so as to form tortuous flues,

leading from the atmosphere outside the furnace into the chamber f,-and the flat-sides of the plates would, in this modification, form the bottom of the combustion-chamber.

I am aware thatit is not new to lead airinto the combustion-chamber and re-box, (both cold and hot air.) and through direct ues in the furnace-walls.

I aml also aware that cold and warm air have been discharged into the fire-chamber both above and below the incandescent fuel, and also through a bridge-wall; but I am not aware that heated air has ever been admitted or discharged into the flame or gas in opposing directions, as herein described and shown, whereby the heated air is thoroughly and .minutely'colnmingled with the flame or gas to insure complete combustion, and to check the current ot'gas or Game. The enlarged combustion-'chamber permits the practically complete combustion of the gas therein beh and the perforated plate and chamberf, all

arranged with reference to each other and the boiler, as described, whereby the heated air is introduced and commingled with the gas or flame in the combustion-chamber, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

KINGSBURY M. J ARVIS.

Witnesses:

GEO. HoLMAN, BENJ. K. DAVIS. 

